Imports of package testing

PathSynopsis
github.com/googleapis/gnostic/OpenAPIv2
github.com/googleapis/gnostic/compiler
gopkg.in/yaml.v2Package yaml implements YAML support for the Go language.
io/ioutilPackage ioutil implements some I/O utility functions.
osPackage os provides a platform-independent interface to operating system functionality.
syncPackage sync provides basic synchronization primitives such as mutual exclusion locks.